Improvement in attaching knobs to their spindles



tth ttnt i@ anni @fine angle or out of hne with' lug f.

.the shank against the pawl 'E forces the latter back Letters Patent No. 112,134, dated February 28, 1871.

IMPROVEMENT lN ATTACHING KNOBS TO THEIR SPINDLES.

The Schedule referred to in these Letters Patent and making part of the same.

Nature of th Invention.

My invention relates to the attachment of doorknobs to their spindles, and consists in the means employed for the purpose, as fully set forth in the claims.

General Description.

In the drawing- Figure 1 is a section ,of my improved knob attached toa door.

Figure 2, a perspective View of the spindle, sleeve, spring, and knob-shank detached.

Figure 3, a face view ot' the rose..

A represents the door;l

BB', the knobs;

C C', the knob-Shanks; and

y D, the spindle.

In general arrangement these parts are the same as those in general use.

The spindle and the socket a of the loose knobshank G are both made square in cross-section, as shown in fig. 2.

A screw-thread, b, is cut upon the corners of the front end of the spindle, and a similar thread, b', in the square sides of the sockets, which threads intermatch or engage when turned together, yet allow the spindle to slide in and out of the socket when the corners and sides are coincident.

A sleeve, E, having a square socket, rests upon the spindle just inside the rose G.

This sleeve is pressed outward by a coiled cr other spring, H, which rests .against the ordinary Icam I, inside thedoor.

The sleeve is provided with a projecting lug, j, and the end of the knob-shank with a similarnot'eh, g, which, when in coincidence .rstrike together or engage, thus locking the knob-shaft to the spindle.

Tile action is as follows:

'lhe knob-shank C is slipped 'upon the projecting end of the spindle, with the notch y standing at an The pressure of' tillthe shank is firmly seated, when a slight turn of the latter brings the' notch and lug in line, when the. sleeve springs back again, thus locking the shank to the spindle, as before described.

lhe turning of the shank also Vlnings the sharp corners of the spindle against the squares of the shank-socket, by which the screw-threads are engaged, thereby securing the shankfnnd spindle iirmly together. The slight turn of the' shank to make this connection and engagement also causes the end of the shank to press in slightly by the engaging of the screw-threads, so as to take up any slack, and prevent any end motion or looseness of the knobs.

'The object of this invention is to furnish a better .connection for the knob-shank and spindle than the ordinary screw, which is constantly working ont, and, besides, allows only1 a xed and absolute adjustment to doors of diierent thicknesses, in lieu of the holes bored in tue spindle for the screw to strike into.

In my device the parts can never become disengaged, except by design, and they can be adapted exactly to the thickness ofthe door by pressing closely up to place, as the screw-threads will engage at any position. It' there is any difficulty from this source, merely withdrawing the spindle and inserting it ina different position will obviate it, as the screw-threads are4 gradual, as where cut in an unbroken line.. Or, if desired, the knob-shank may have four ot'the notches .g on the -four sides,'which' will allow it to engage with the lug of the pawl in any desired position without changing the spindle.

By Amy arrangement, I also gain a great advantage in firmness. and strength, as the screw-threads lock the whole length of their cut. Where the common screw is used but a single point of connection is made. At the same time that I thus secure a connection the whole length I can break the engagement by a partial turning of the shank, and thus withdraw the spindle. If a continuous or whole screw-thread were cnt, the engagement and disengagement could be made only by making many "successive turns of the shank.

In order to prevent the looseness that might otl1er wise occur, I form the eye of the rose G with atlange, p, which forms a stop' to the end of the knob-shaft, as clearly shown.l When the knob-shaft is turned up it rests closely' against this stop,'so that no material end play can be produced. vIt' there is any dilicnlty in adjusting, a mere change oi' position ot' the spindle will remedy it, as before described.

Claims.

What I claim, and desire to secureby Letters Pat# ent. is-

l. The springfsleeve E, provided with one or more lugs,j', in combination with the square spindle, having screw-threads b upon its corners, and the knob-` shank O, haring interior screw-tln-eads b', and one or more recesses g, for the purpose specih'ed.

2. The rose G, having the lange p, in combination with the spring-sleevelE, spindle l), and knoh-shanks G, for the purpose specih'ed` In witness whereof I have hereunto set my hand lthis 5th day of December, 1870.

NVM. A. FEN N Witnesses:

1t. F. OscooD, FRED. A. HATCH. 

